Centrifugal filter-press.



F. ATKINS.

GENTRIFUGAL FILTER PRESS.

APPLIOATION FILED JUNE 1, 1908, RENEWED MAY 2, 1910.

F. K. & E.

Patented Jan 3, 1911.

wivtmaooeo F. K. 6; E. F. ATKINS. CENTRIFUGAL PILTERPREss.

APPLIUATIOBI PI LED JUNEl, 1908. RENEWED MAY 2, 1910.

Patented Jan. 3, 1911.

e SHEBTSSHEBT 2.

Suva Whom P. K. & E. P. ATKINS.

OENTRIFUGAL FILTER PRESS. APPLIOATION FILED JUNE 1, 1908. RENEWED MAY 2, 1910.

Patented J an. 3, 1911.

6 SHEETS-SHEET 3.

P. K. & E. F. ATKINS.

GENTRIFUGAL FILTER PRESS.

APPLICATION FILED JUNE 1, 1908, RENEWED MAY 2, 1910.

Patented Jan. 3, 1911.

6 SHEETSSHEET 4.

' mvemtou Qwitne/aoao K. & B.

OENTRIPUGAL FILTER PRESS.

APPLIUATIOH FILED JUNE 1, 190a. RENEWED my 2, 191

I Pa zemeol JanQS, 1911.

6 SHEETBSHEET 5.

F. K, (in E F. ATKINS,

GENTEIFUGAL FILTER'PRESS.

APPLIOATION FILED JUNE-1, 190s. RENEWED MAY 2, 1910.

Patentd Jan 3, 1911.

6 $HEETS-SHEET 6.

Wdmaooco .only as a dewatering machine, but for the FRANK K. ATKINS AND EARL F.

ATKINS, OF DENVER, COLORADO; SAID EARL F.

ATKINS ASSIGNOR TO AID FRANK K.,.ATKINS.

'CENTRIFUGAL FILTER-PRESS.

Specification of 176mm Patent.

Application filed June 1, 1908, Serial No. 435,882. Renewed May 2,1910. Serial No. 558,906.

To all whom it may concern:

Be it known that we, FRANK KATKINs and EARL F. ATKINS, both citizens of the United States,

- This invention relates to improvements in apparatus for filtering sedimentary solutions, and the separation of solids from liquids generally.

Our improved apparatus may be used not extraction of slimes from the gold or silverbearing cyanid solutions in cyanidation or the finely ground ores from themetal values in solution in any method forthe treatment of ores by the use ofsolve'nts.

In our improved construction centrally located standpipe arranged to 'rotate with the bowl and communicating with radially disposed distributing pipes leading from the lower extremity oiLthe standpipe outwardly to theouterportion ofthe chamber of the bowl. Within the standpipe and made fast thereto is a screw thread or spiral blade open at both ends to permit the passsage of the material to be treated. The centrifugal force developed in carrying the material ,from the discharge extremity of the standpipe outwardly through the distributing pipes, produces a pressure within the chamber, proportionate to the speed of the bowls rotary travel. Within this bowl are located filtering elements or units which as disclosed in the specific construction illustrated in the drawing arevertically C llS- posed and radially arranged, the bowl being equipped with suitable meansfor maintaining the filterlng units in their respective positions. Each of these filtering elements consists of a suitable rigid body portion ex= tcriorly provided on both sides with grooves orcorrugations forming passage ways for the filtered liquid. These body portions are covered with a suitable filtering medium.

residing in the city andcounty of Denver and State of Colorado,

we employ a bowl mounted to rotate and fed from a- 'sultable pipe, w1th an which as shown in the drawing is formed In the particular construction shown in the Patented Jan. 3, 1911.

drawing, a layer of wire cloth is placed in direct contact with the body portions of the filteringelements while outside of this wire mesh material is'placedcanvas or other suitable woven fabric.- The wire cloth or fabric,

forms a support or backing for the outer layer of canvas and prevents-the latter from collapsing or dipping into the corrugations ofthe surface of the b'o'dy portion of the elements. It must be understood that any desired filtering medium may lee-employed in connection with our improved apparatus and that the claims which are not drawn to the specific construction and arrangement of the filtering elements or: units, should be construed as of sutficient scope to cover filtering elements of any desired construction and arrangement.

The filteringimedium when applied to'the body of the filtering element, istightlysecured thereto, forming a complete envelop v 1 for the body member, whereby the entrance of liquid to the corrugations or grooves of the body member, must pass through the filtering-medium. The interiorof each filtering element is connected by means of a annular chamber integral with the inner wall of the chamber and communicates with the atmosphere only by a valve-controlled pipe whereby atmospheric air'may be cut off from communication with the interior of the filter at will.

Each filtering element is also provided with .an-outlet' pipe communicating withan ex terior annularly arranged chamber formed integral with the outer wall of the bowl. Leading from outlet pipes ea-ch terminating in a gooseneck which issdarranged thaL the liquid this last named chamber are is trapped therein. .This outlet pipe is also controlled by a valve. The chamber of the bowl outside ofthe filtering. elements, also communicates at the top with the atmosphere by a valve-controlled pipe while the lower portion of the bowl is provided with valve-controlled discharge pipes for the escape of the solid material resulting from the process of filtration. Provision is made for operating all of the aforesaid valves by electro-magnets; whereby it is only necessary to operate a switch arm to open or close. any valve. inthe goose-neck pipes may be simultane- For instance-all of the valves located ously opened or closed while the air valves nonnected with the filtermgpeler'nents and aisojwith the chamber of the bowl are arranged to be simultaneously opened or closed.

Furthermore as shown in the drawing the nection with the apparatus, the parts being magnets for controlling these air valves are in the same circuit with the magnets for controlling the goose-neck valves, but the arrangement is such that when the goose 1O neck valves are closed the air valves are thebowl are arranged to be simultaneously the -0p-.

opened and closed independently of eration of the other valves.-

- Having briefly outlined our improved construction we will. proceed to describe the same in detail reference being made to the accompanying drawing in which is illus trated an embodiment thereof.

In this drawing, Figure 1 is a central vertical section taken through our improved filtering apparatus. Fig. 2 is a top plan view of the same or a section cutting the standpipe above the top of the bowl andlooking downwardly upon the latter, the. top of the bowl being partly broken away to disclose the interior mechanism. Fig. 3

is .a fragmentary sectional View similar to each filtering element. 7 View of one of the filtering elements or units, with the filtering medium partly. broken away. Fig. 6 is a longitudinal section of the same. Fig. 7 is .a top view in detail showmg the electro-magnetlc means for operating the varlous valves employed in con shown on a larger scale than in the'other views, Fig. Sis a .side elevation of a modi- 'fied form of filtering element or unit. Fig. 9' is a section taken on the line 9f9 Fig. 8.

Fig. 1 with the parts on a larger scale. Fig; 1 showsa top and side elevation of an out- -let pipe or discharge nozzle connected with Fig. 5 is a detail 5 Fig.10 is a detail view of the filter frame orbodyof the form of construction shown in Figs. 8 and 9. In this view the filtering medium which it is assumed is composed of stone or" other suitable rigid porous matev rial, is removed. Fig. 11 is a diagrammatic vieiv illustratingthe circuits in which are located the electro-magnets for opening and closing the various valves connected with the apparatus.

same. parts in all the views.

.Let the numeral 5 designate a bowl mounted to rotate and having a chamber 6 communicating with'a stand-pipe 7 by means of The same'reference characters indicate the,

speed of the bowl.

ing from the bottom of the standpipe to the outer portion of the bowl. the bowl is provided with a. drum '98 engaged bya band brake 9 for'controlling the The band of this brake is connected with a rodlO to whose outerextremity' is connected a. foot lever 12 ful- 'crumed at 13. Therod is surrounded by a coil spring 14 interposed between a bearing 15 and a stop .16 on the rod. This spring serves to automatically release the brake.

whenthe' pressure employed to apply the brake is released. Below the brake drum is a journal 17 entering a recess formed in a step box lS. In the bottom of this recess is a double convex disk 97 which is engaged by the lower extremity of the journal. Be tween the step box and the brake drum is an operating pulley D connected with a belt E which may lead from a line shaft or ing the rotary movement to. the bowl. Arranged to register with the upper extremity of the standpipe .is a stationary feed pipe F which enters a stuffing box Gmade fast to "tion the weight of the rotary bowl, is distributed being partly supported'uponthe frame work L while" thebottom journal .17 engages the double convex .disk inlthe step box as heretofore described; Theyielding plate I afi'ords sufiieient support'to prevent undue pressure uponthe disk in the step box. The weight on r the bowl being thus distributed, prevents undue wear upon either of the bearings. 'The stan'dpipe 'is braced and centered within; the central space M formed bythe inner'wall N ofthe bowl, by 110 two-part rods 0 whose members are connect ed by turn-buckles P. The outer extremities of these rods are connected with washers or bearing disks Q, which engage the wall' N, while'their inner extremities are threaded into a ring R surrounding the standpiple and also an insulating sleeve S mounted on the standpipe for a purpose hereinafter explained. I

Mounted in the lower part of the standpipe is a spiral blade or screw thread T' forming an open-ended spiral passage com municating. with the inner extremities of the distributing'pipes 8-. Located with-in the chamber 6 of the bowl are vertically disposed, radially arranged filtering units or elements Ueach composed of a body member V havlng corrugated surfaces W. The

corrugationsor grooves of both of these sur- The bottom of any'suitable mot-or (not shown) for impart- 5 radially disposed distributing pipes 8 leadl faces extendhorizontally and terminate at a the upper extremity of the rotary standpipe. i

discharge is provided wit solenoid coils.

vided with rack teeth, and they engage segof the valve.

vided with ribs J. The upper outer-corner of each plate is provided with a pro ectioic rz 1S- whose edges are threaded to receive a charge pipe or nozzle a which is interiorly threaded as shown at 7) for the purpose. Th1s part Z is a fiat plece formed integral with thebody of the plate V, and threaded on its upperand lower edges to connect with the interiorly threaded nozzle a. Hence this element and the" liquid escaping from'the filtering unit passes out of the unit through the nozzle and on both sides of the element Z, This nozzle is enlarged at; its outer extremity as shown at c and provided with a depending outlet nipple with a circumferential chamber 82. formed integral with the outer wall 83 of the bowl. The opposite upper corner of the filter plate h an opening 6 and is formed into a, short exteriorly threaded nipple I adapted to receive an interiorly threaded sleeve 9 swiveled en a short pipe h'communieating witha'chamber 85 formed integral withthe inner wall N of the bowl. Each filter plate is enveloped'in a canvas bag or covering a which is so attached as to completely cover the plate andprevent the entrance of liquid from'the chamber 6 except through the filtering medium. It is pre-- ferred to ap-ply'wire mesh'fabric j to the opposite sides of the filter plate to form a support or backing for the canvas, to prevent the latter from dipping into the grooves and passages of the plate. These filtering elements, are dropped into the bowl from above, their inneriedgesbeing engaged on opposite sides by lugs 70 mounted onthe wall N. of thebowl while their outer edges pass between bottom lugs 7, formed on the bowl. These filter units are further secured in place by means of set screws a threaded into the removable-top m of the bowl, their inner extremities bearing upon the upper surface of the discharge nozzles c.

-Connected with the chamber 85 is a pipe. 86 controlled by a valve 77. Connected withthe'chamber 6 of the bowl is a pipe 88 controlled by a valve 7 8. H

Connected wi h the chamber 82, are outlet pipes 87 each terminating in a goose-neck 89 and controlled by a valve 19 located between the extremities of the pipe.

Each valve 19 is controlled by two solenoids 21 and 22, provided with bars or cores 23 and 24:,111011I1i8di0 reciprocate within the Each of these cores is-proments A and B of a gear, fast on the stem C The cores or reciprocating bars of the solenoids thus become toothed racks for the opening and closingof a valve divides 'the discharge pipe or nozzle a,-

(Z communicating 19, and as each of these valves 19 is operated in the same way, the descriptlon of the op erating mechanism for one valve Wlll suffice.

B virtueof this construction for opening and closing the valve, 'it may be assumed that when the solenoid 21 is energized, the

rack bar 23 is drawn inwardly, and acting upon the gear segment A,- imparts a suffi-. cient movement to the valve 19 to open the same, the gearbeing connected with the stem C of the valve, as heretofore explained. Now, when it desired to close the valve, the magnet 21 is deenergized, and the circuit closed through the magnet 22, whereby the raclt bar .24 will be moved inwardly and reverse the movement of the valve, heretofore. explained, and close the same. The opening or closing of all .of the valves 19 may be simultaneouslyeffected by the simple movement of a switch arm, while the bowl is still in motion. of our improved construction.

' The bowl is provided at its bottom with discharge pipes 25, controlled by valves 26,

which are opened and closed in the same manner as the valves 19;. That is to say, two magnets '21 and 22 are employed to alternately actuate rack bars 23 and 24, which act on gear segments A and B, connected with the stem C of the valve. When the circuit of onemagnet is closed, and the magnet is energized, the rack bar is moved inwardly and acting on the gear turns the valve in the direction to openthe same;

while, when the other magnet is energized, the movement of the valve is reversed.

It will be understood that before energizing either magnet the circuit is broken through the other magnet, whereby the latter is deenergized. thus allowing its rack bar to move outwardly without resistance in response to the. inward movement of the other bar. The pipe 25 for the removal of the solids from the bowl, is controlled in the same manner; and hence, a description of 1 the mechanism for operating one valve 26, is sufiicient, for the reason that the mechanism for operating each valve is the same or identical. It may be stated that the valve 26 is alsoopened and closed while the bowl is in motion, by the use ofordinary means for making and breaking the electric circuits in which the solenoids or magnets are located. Y

The air valves 77 and by solenoids in the same manner as the valves 19 and 26. As shown in the drawing and hereinafter described more in detail, the magnetswhich control the valves 7 7. and 7 S are located in the same circuit as the magnets that control the valves 19, but are so arranged that the valves 77 and 78 are opened simultaneously with the closing of the valves 19 and closed simultaneously with the opening of the valves 19., though This is an important feature- 78 are controlled I as heretofore intimated the air valves .if desired be opened and closed independ ently of the valves 19 and also independently of each other. I

'In forderfto accomp'lish'the operation oi the valves in the manner -'heretofo1'e ex plained, the standp ipel7 is equipped with a number of distinct rings, which we will designate as 36, 37, 38, 3 9 and '40 respectively. 'The se rings are insula ed from each other, as shown at S, and are respectively engaged by stationary brushes, or electrical contacts 42, 43, 44, 45 and 46. The brush 42 is located in the electrical circuit of the magnets 21 which act to open :all of the ,valves 26, while the brush 43 is located in the circuit of the magnets 22, which actto close all of the valves'26. The brush 45 is located in the circuit of the magnets 21, which serve to open all ofthe valves 'l9 and close both valves 77 and 78; while the brush 46 is located in the circuit of the'magnets 22, which serve to close all of the valves 19 and open the valves 77 and 78. The brush 4.4 is in electrical communication by means of a-conductor 47, with a pole 48 of an -electrical source 49, which is common to all of the circuits (see vFig. 11). Conductors 50, 51, 52 and 53 lead from switch arms 1,

2, 3 and 4 respectively of a switch board 84- to the brushes 42, 43 45 and 46 respectively.

These circuits will be understood from Fig,

11, a diagrammatic, view, to which special reference will now he, made. In this View the inner series of circles represent the rings 36,37, 38, 39 and 40. F rom these rings, conductors 54, 55, 56; 57 and 58, lead respectively to other conductors represented y an outer seriesof circles and designated 59, 60-, 61, 62 and 63 respectively. From the circular conductor 59, lead branch conductors 64 to oneterminal of all of the magnets 21 for opening the valves 26; while the other terminal of each: of said magnets ,is connected by a conductor 65 with the C11- cular conductor 61, which is connected by meansof the conductor 56, with the ring 38, which is engaged by'the brush44, from Whichleads the conductor 47 to the pole 48 of the electrical source 49. From the opposite pole 66 of thissource,-leads a conductor 67 to a contact 68, forming a part of the switch board 84. Now, when the switch arm 1 is moved to engagement with the contact 68, the-circuit is closed througlrall ofthe magnets 21 of the valves, 26, and those magnets being energized serve 'to open the said valves by movlng the rack bar 23 mwardly, and actuating the segment A-connected withthe valve stem C (see Fig. 7)

' But when it is desiredlto close the said valves, theswitch arm 1 is disengaged from the contact 68 and the switch arm 2 is thrown into engagement therewith, in

which event the path of the current may be minal of the magnet through the conductor current may 'besaid to pass through the conductor .51 to the brush 43 of the contact ring 37, and thence through the conductor 55 to the circular conductor 60,.and thence traced through the magnet 220i the valves I 26, as follows: From the switcharm 2 the through a conductor 69 to one terminal-of the magnet 22 of the valve 26, thence to the magnet coil, and from the opposite ter-.

' current may be said to be as follows: from the switch arm 3 through the conductor 52,

the brush 45,'the contact ring 39, the condnctor 57, the circular conductor 62,"a conductor 70' leading to one: terminal of the magnet 21 of the valve'1 9, from the oppo site terminal of the magnet to the conductor 65,'thence to the circular conductor '61,' thence through the coiiductor 56, the contact ring 38, the brush 44,"the con ductor' 47, the electrical source 49 and the co "ductor 67 to the-switch board-contact 68. a

The valves'77 and 78 "being-"in the lame I circuit with the valves 'l9, are arranged to be closed simultaneously. (with theopening .of the valves 19. "In th I, hcasethe savor the current 1s thesam'e as just described until the circular conductor 62 is reached,

in which event-the current passes through, aconductor 7am amagnet 22, and from'the terminal ofi-the -lastlna'med magnet, through a conductor 80 to the" circular conductor 61, completin the circuit in the same manner as hereto ore described and which will be readily understood by reference to Fig. 11.- This description applies to bothvalves 77 and 78. Again, if it is desired to close the tvalves' 19, the switch' arm 3.is disen- .gaged from fllGgCOl'ltEtCtGS, and the switch arm 4 thrown-into engagement therewith,

in which event the path of the current may be said to be as follows; from the switch arm .4 through the conductor the brush '46-, the contact ring40, the conductor 58, the ,circular conductor 63, a conductor 71 connectedwith one terminal ofthe magnet 22,

thence through the coil of said magnet, and from theopposite terminal of-the said coilto the conductor 65, and thence through the conductors 61 and 56 to the contact ring 38,

the brush 44, the conductor 47, the electrical source 49 andthence through the conductor 67 to the contact 68 of the switch board.

Simultaneously with the closing of the valves 19, the valves 77 and 78 are opened and the path of the current in each case is the same until the circular conductor is reached, in which event the current passes through a conductor 81 to one terminal of each magnet-21 and from the opposite ter? minal of said magnet through the conduct, 1'

tor 80, to the circular conductor 61; thence completing the circuit in the same manner as heretofore described.

From the foregoing description the operation of our improved machine ,will be ob se rved, is arranged so as'to feedthe'ma ,terial into the bowl under gravity, or purnp pressure when such-may'be'available. When 1 .ing

' rial by revolving the bowl,

' centrifugal force. In this manner the Y filtration is done Bowl in which the following devices'are 1mused in thisfmanner, the accnmuia'tion'fiof s'olids upon the-outer surface of the filterto remove these solids, valves in pipes 25am opened and the may be rotated and if there is aL-tendency for the solids to pack against first impart the -rota'ry then 'the' band brake 9 is brought ixrcontact with the shaft which suddenlyfchecks the speed of the bowl, and this impelsthe solids tobreak loose from the outer wall. Thereafter water is fed into the bowl through the standpipe; the bowl continues to revolve and the water disintegrates the solids permitting them to be discharged through the outlet pipes under solids are readily released from the bowl. During the discharge of the solids the'filtering'operation is of course suspended. Thus when gravity pressure is available we. (an make the separation while the machine is at rest and apply the power onlyfor the purpose" clearing'out the solids.

WVhen gravity pressure Is not available by merely rotatingtheportant-v in creating a powerful pressure of the liquid upon the filtering. surfaces within the bowl. The distributing pipes containing their columns of liquid, extending prac-- tically in line with the resultant force dc velop under the rotary sure against the filten.

speed a strong pres- By adjusting the length of the distributing pipes and regulating the speed of the bowl, any desired pres sure may be had and high ressures, therefore, may be readily obtaine and it may be further stated that the'distributing pipes are important since they compel-the materials t he'fqnter' Will," we; themate- -units, will necessarily occur. In order j ingin t "the solids and air' valves 77 and 78 being opened; this inpifilling the chamber 6 with water, that portion exterior to the filtering units being filled with unfiltered solution, and the filtered solution. When.

the rotary tained within the filterunits, and a vacuum 1 suction ressure, equlvalent' i'n actual practice to a out twelve pounds per square in'ch of filter area, is'obtained. To attainsuch results, howev er, it is necessary to prime the bowl inmanner following: If desired, the- 'bowl ma. b primed while at rest by feedstationary 'feed pipe and standpipe, the valvescontroLling' the pi es for dischargin and filtered so ution, being closinterior thereof with the bowl is fully primed, the air valvw are and the bowl otated. 7 'then proceeds at a mpidraie, the pressure against the filtering medium produced irom the various causes, as foiiows: F gravity sure as maybe applied bythe height 0 the vertical column oi the wmbined feed pipe and standpi'pe; second, that produced by screw within the standpipe; third, the direct. pressure resulting from the increased Wei htof the materials under the application 0 centrifugal force; fourth, the vacuum suction pressure against the sur faces of the filtermg medium, as elsewhere rovision 18 made, howreferred to herein. ever, whereby the bowl may be continuously operated thereby avoiding the necessity of stopping the bowl either to prime the same r-t'o clean-out the solids in the manner follbwin'g: Assuming that the bowl is revolving-at the desire tered solutionis fed into the bowl, valves 19 and- 26-being closed-and air. valves 77 and 78 being open. The feed is continued'uutil the air'is' ejected f om the machine and the chamber filled with .the filter units with the unfiltered, and the interior including chambers 82 and 85 and pipes 87 with the filtered solution. When the liquid discharges at both valves 77 and 78 the same opened. Under the centrifugal force we employ, the weight of water nfthe line of the resultant force,; mercury under the force ofgravity, with the result that, the filtered water is impelled to flow outwardly from the. interior of the e: unfiltered solution-through the rate of speed, the unfilliquid, the exterior ptare closed an'd-v alves 19 are is. twice or". more times vfilter and chambers andtakes its place in the goose-necks and extends baokwardly 1n the pipes only to about the point w (see F ig.

3 Where it is held in place by atmospheric pressure. Thenceforth water discharges at the goose-necks in like quantity only 'as it pereolates through tl1e'filter,ajvacuum being maintained in the interior thereof.

'By means of the electro-magnets whereby the valyesmay beopened and closed While the machine is revolving, it is possible. to operate the machine continuously, cutting ofi' the feed'only while-the solids are being discharged," theron-ly occasion for stoppingthe machinebeing to; replace a filter that is worn out or faulty. After the bowl has once attained therequired speed, compara tivelylittle power is neede'd to keep :1t.re-

volving, hence the desired "pressure. is economically -maintained. It may :also .be stated'that the machine designed to give? the greatest possible filtering area -within."

the revolving chamber, and the 'filter units: are in such relation 'to the result-ant, force, that-the solids which otherwise wduldac j cumulate against the filtering surfacesfiare carried outwardly and accumulate upon the outerw-all of the-bowl: Thusiceritrifugal force materially aids inthe work of se' ara tion.- o

- \Vhen the press is usedfor s'eparatingthe slimes. from the ,cyanidsolution in cyanida-l .tion and where the cake of solids formed on' the outer wall contains gold or silver values in solution in the moisture therein, thesaid. cake may be washed before discharging the same by feeding in clear water'through the feed pipe valves 26, 77 and 7 8. being" closed, and valves -11) opened, whereby the water in discharging from the machine carries off the values in diluted form; The same met-bod s applied an washing the sludge in the sugar factories.

I y In case solvents are used which attackithe metal of the bowl, the same may be lined with nameh'glass, lead or other material to protect the same. This lining is designated 4i in the drawing.

Attention is called to the fact thatfthe centrifugal, force due to the rotary move-- ment of the bowl, in carrying the solids outwardly against the iunersurface of the outer walls, so effectually relieves the exterlor surface of the filtering units as to keep them,

continuously almost clean, thereby permitting rapid percolation of the liquid through the filtering medium during the filtering operation, I \Vlicfi it is desired to use the filter for the clarification of water for drinking purposes.

,it will be found desirable to employ a filtering medium composed 'of. porousstone; A 1 filtering unit or element-ofthls character is illustrated in Figs. 8 to 10 inclusive, In

' -.eso',sue

these views le t thenumeral designate a. filtering unit considered. inits entirety. This unit is composed of a rigid frame 91 having intersecting vertical and horizontal barsshaped to 'receive section's 92 of the stone filtering medium. These filtering sec 'tions are placed in the frame which is cut I out to receive'them as shown .at 93. They are secured attbe corners byiwashers 9 L which overlap the filtering sections and are held in place byfastening screws 95. The

intersectln'g bars which, constitute-the interior of the frame are perforated as shown at 96 -whereby the spaces covered by the 'filterin sections applied to the. opposite sides of t e frame are 'intercommunicating. These filtering elements or units may-be arrangedin the bowl in substantially the same manner as the filtering units U' already fdescribeda Each frame is: provided at its upper left-hand corner rwith-i an exteriorly threaded' nipple -99, while the opposite corf1er isp'rovided' with a flat plate 100 threaded onfltfs opposite edges to receive thesilis =charge. ipeor nozzle -a.-. In the operation pf the; teringappa'ratus withunits of this character .the' fstone filtering sections 92ieinstitute the'filtering medium as heretofore ex plained'and takertheplace'of the filter ng ':medium employed in thefiltering units U in th'e otherform of construction. I T-he solid materiat which escapes through theoutlet pipes 525 as heretofore explained, enters the lower waste trough '70 as willbe readily understood.

=Atte1'1tion isdirected to the as that the arrangement of .the'various parts of the source of supply- "(not shown), the valves in the one or-amor'e pipes 87, leading 'tothe 'goosenecks which have "such hose connection are openedand the valves in any of the pipes 87 where the goosenecks have no such hose connection. are closed.- The water is in this manner fed into the interior of each filtering element under such pressure as may be desirable to apply, and inasmuch as pipes 25 drain chamber 6, which. rel eve the exterior of the filtering elem'en s from pressure said water is forcedthrou h the filtering medium outwardly, and this maybe continued until the saine are thoroughly cleaned without removing them from the bowl.

I chamber-of the bowl, filtering units radially "of'the bowl for the filtered solution, and connected with the interior of the respective interidr of the filteringunitsbeing imcom (30 termg units, substantially as described.

:the entrance of the liquid to the interior of, each filtering unit, means for sub ectingthe unfilteredmateria'l within the bowl to;the-- munication with the bowl, distributing pipeseach filtering unit, substantially as I described. 1

controlled discharge outlets also commune Having thus described ,our invention, 3-. A centrifugal filter press, comprising a what we claim is:

1.. In filtering apparatus, the combination I of a bowl, a standpipe for feeding the m'aterial to be treated to .the bowl, filtering elements radially arranged within the chamber of the bowl, the said elements comprising-a channeled body part, and a covering composed of a suitable filtering medium, and a pipe connected with the interior of each filtering element for conveying the filtered solution through the outer wall of the bowl.

2. A- filter comprising a bowl, a standpipe, distributing pipes leading frbm -the bottom of the standpipe to the outer portion oft-he arranged within the bowl, each comprising a ho y member andan exterior covering forming a filtering medium, theconstructio'n of the body part b'eing. such as to permitnecessary pressure for. forcing the liquid through the filtering medium, and a pipe 3. In a centrifugal 'filtel,press, the combination of a bowl mounted to rotate, means for feeding the unfiltered solution to thebowl, filter ng units radially arranged within the bowland composed of a body partand a filtermedium covering, the body of the filtering unit being channeled to per1nitthe entrance of the filtered liquid, and outlet pipes-protruding through the outer wall filtering elements, substantimlly as described. 4. A centrifugal filter press, comprising a bowl mounted to rotate, a standpipe in com connected withlthe bottom of the standpipe and leading outwardly therefrom and communicating withthe outer portion of the chamberfof the bowl, hollow filtering'el'es ments radially arranged within the; bowl, and provided with an exterior covering forming-a suitable filtering medium, and -a discharge pipe protruding through the ou er wall in communication with the interior 0 5. In a centrifugal filter'press, the combinatio'n of'a rotary bowl, means for deliver; ing the solution to be'filtered, hollow filtering units arranged-within the bowl and covered with a suitable filt ering-medium, the

munication with the atmos'phereby a valvecont-rolled passage and provided avath valvei with the n r of the respective fil' rotary bowl, ho low radially disposed filtering elements mounted 1n the bowl, each filtering elementhaving an exterior filtering medium through which the filtered liquid must'passto the interior of thefilter'ing'elementj,'pipes for the discharge of the filtered solution'froln the respective filtering ele-. ments, the' said pipes being provided with i'alres forfopemng and closing the same, substantially as described;

7 In a centrifugal filter press, the m bination' of a rotary bowl, radially disposed.

filtering elements mounted in the bowl, a standprpe-centrally connected witlr the bottom of the bo\\'l,.distributing pipes leading outwardly-from the bottom'of the standpipe and communicating with the outer part of the bowl, each filtering element or unit comprising a rigid bodv covered with a suitable filtering medium, the body part being open to form-fa s ace fol-"the filtered liquid, a valve-controll ed air pipe for controlling the I passa 'e-of air to or its exit from the interior of a lterin unit, and a .valve controlled' outlet 'pipe'a so communicating with themdescribed. e

' 8. A centrifugal filter press comprising a rotary bowl, filtering elements located therein, means for feeding-the material to be treated to the bowl, and a liquid trap for-cuta terior'ofeajch filtering unit,-'substantially' as tingofi the air from the-interior" of each therefrom, said trap being formed by bending the outlet pipe upwardly and inwardly filtering element under the actionof centrifugal forcd'while the liquid is 'free to escape .at its outer extremity, substantia ly as described.

9. The combination with a bowl mounted to rotate, of hollow filtering elements or units arranged within the bowl and-provided with-outlets forthe escape of the filteredrliquidunderthe action of centrifugal the interior of the filtering units comprising a liquid trap for each unit under the-action tially as described.

f 10. The combination ofa bowl mounted to rotate, hollow' filtering elements mounted in the filterdliquid including "a pipe bent upwardl'y'and inwardly at-its outer extremity,

inwardly.- at its "outer extremity, substanthe bowl,eacl1' 'eleme nt having an outlet for force, and means forcutting oil the air from means-for cutting'oflt' thejair from the vari- 011s 'filterin elements, and a. standpipe for deliveringt bowl." I i f 11. The coabination ofa rotary bowl, a

the bottom of thegstandpipeand terminating e naterial to be treated to the.

standpipe centrally connectedavith the bowl, '-ditributing pipesgleading outwardly from outlet-'includinga pip'e bent upwardly and inwardly at its outer extremity, andn eans I and provided with a discharge outlet for the a from .the'interior of tbe--filter,.the filtering openingiand closing the valve in the esca e filter therein, a valve-controlled outlet for ing the material to be treated under pressure interior of the filter.

of the filtering units arein communication,

said last named chamber and terminating in chamber.

at the bottom of the outer portion of the chamber ofthe bowl, whereby ,the liquid delivered tothe' bowlunder a pressur'e'due to the-height of the standpipe of the centrifugal force imparted to the liquid by the bowls rotary action, hollow filtering elements located within-the bowl, provided with outlets for the discharge of the filtered liquid, each for cutting off atmospheric air from the interior of thefiltering elements.

12. In a filter press, the combination with a bowlmounted to rotate,"means for deliverto thegbowl, a filter located'within the bowl filtered liquid, including a pipe bent up-.- wardly and inwardly at its outr extremity, and means for cutting oil, the air-'from the 13. The combination of bowl mounted to rotate, filtering units mounted within the bowl, an annularair chamber .vvithw'hich all;

means for cutting ofi theair from the said chamber, whereby atmospherleair is cut o'fi'.

units being provided with discharge outlets for the filtered liquid, an annular chamber witlrwhi'ch-said outlets-communicate, and

valve-controlled outlet pipes leading from goose-necks, substantially as described.

14. The combination of a rotary bowl, cir

cular chambers surrounding the bowl both interiorly and e'xteriorly, filtering u'nits mounted within: the bowl and in communication at one extremity with the interior circular chamber and atthe other extremity with the exterior chamber, discharge pipes leading from the exterior chamberand -ter-' minating in goosenecks, and means for cut? ting oil the air from theinterior circular outlet for the escape of the filtered solution, a valve-controlled vent for the interior of the filter,' and electro-magnetic means for ine for the filtered solution, simultaneous y 1th the operation of the valve in the vent pipe, substantially as described.

17. A bowl mounted to rotate, a hollow 6. A bowl mounted to rotate, a filter lo- I rated within the bowl, a valvecontrolled' the filtered-solution, a valve dontrolled vent connected with the filter or in communication-with thefilter, and electro-magnetic means for opening the valve in the liquid discharge pipesimultaneous1y with the clos. ingot the valve inthe vent pipe and vice yersa, substantiallyas described.

18. The combination'of a rotary bowl, a

.hollow'filtei located. therein, a discharge pipe. for the filtered liquid, a valve co trolling said. pipe, '2. valve-controlled vent pipe in communication with the filter, a

valveacontrolled vent pipejn communication qvith the chamber 'of-the-bowl, and electromagnetic-meansfor. opening the liquid discharge pi elsimnltaneously with the closing of the va ves in the two vent -pipes or vice .versa, substantiallyasdescribed.

' 19; The cmnbination of a-:rotary bowl, a.

hollow filter located therein, an outlet from the filler-.- for the' discharge of the filtered liquidunder the influence of the centrifugal force, a valvef-eontrolledoutlet in communication .withthe bowllfor the discharge of the solid "material, and elect'ro-magnetic means forf'opening and closing the valve in the discharge pipe for the solids, s'ubstanjtially as described. w

-20. 'Th combination of a bowl mountedto rotate, an"imperforatel-standpipe. communicating with the bowl at its lower extremity, a screwthread fast n' the standpipe and forming-an openlendedspiral passage, the standpipe being connected to rotate with the bowl. N21 The combination of a bowl mounted t'o'rotate, 'a filter located within -the'bowl,

an 'imperforate stand ipeconn'ected to rotate with the-bowl, d stributing pipes leading from the bottom ofrthe standpipe and communicating with the outer portlon of the bowl, the standpipe having a screw thread located-therein andforming a spiral passage 'open at both ends and communicating with the-distributing pipes. 22. In a filter apparatus, thecombination of a' bowl mounted to rotate, filtering units located within the bowl, discharge pipes for "the escapeof the filtered solution from the filters said discharge pipes terminating in oosenecks," a stationary trough; for receiv- .ingthe discharge from thepipe's, pipes c'onnectedvwi'th the bowl for the discharge of the solids, and a stationary trough into which the solids are delivered by thesaid pipes, substantially as described.

23: In a centrifugal filter press, the com bination ofabowl mountedtto rotate, mea s for feeding-the unfiltered solution to the bowl, filterin units' arranged. within the 5 bowl, and out et pipes for the filtered solution connected with the interior-of the respective filtering elements and having goosenecks' at their outer extremities.

2ft. In a centrifugal filter press, the combination of a bowl mounted to rotate, means for feeding the unfiltered solution to the bowl, filtering units arranged within, the

bowl, each composed of a body part, and a canvas bag covering forming the filtering medium, the body of each filtering unit being fashioned to, permit the entrance of the filtered liquid, and outlet pipes connected with the interior of the respective filtering units, and terminating in goosenecks.

25. In a centrifugal filter press, the combination of aboW'l mounted to rotate, means for feeding the unfiltered solution to the bowl, filtering units arranged within the bowl, each composed of a body part, an inner covering of 'Wire mesh material, and an' outer covering of canvas, the body part of each filtering unit being fashioned to permit the entrance ofthe filteredliquid, and, outlet pipes for the filtered'solution, connected with-the interior of the respective filtering elements, and terminating in goosenecks.

In testimony whereof we aflix our signatures in presence of two witnesses.

FRANK K. ATKINS 1 EARL F. ATKINS. Witnesses for Frank K. Atkins DENA NELSON, A. J. 'OBR EN. Witnesses'for Earl F. Atkins:

C. A. HEGELHEIMER, Asa A. WALLACE. 

